static bool IsClockwise(const DirectX::XMFLOAT3 *vertex, int num_verts, const FbxVector4 &polygon_normal)
{
// Compute a normal using two edges of the triangle
FbxVector4 edge_1(vertex[1].x - vertex[0].x, vertex[1].y - vertex[0].y, vertex[1].z - vertex[0].z);
FbxVector4 edge_2(vertex[2].x - vertex[0].x, vertex[2].y - vertex[0].y, vertex[2].z - vertex[0].z);
FbxVector4 normal = edge_1.CrossProduct(edge_2);
// Dot product between computed normal and supplied normal will reveal winding
double dot = polygon_normal.DotProduct(normal);
return dot < 0;
}
void LabelToolPlugin::mouseReleaseEventOnGraphicsView(QGraphicsSceneMouseEvent *e)
{
if(e->button() == Qt::LeftButton)
{
selecting_ = false;
selected_points_.clear();
selected_points_.push_back(start_point_);
QPointF edge(start_point_.x(), e->scenePos().y());
selected_points_.push_back(edge);
selected_points_.push_back(e->scenePos());
QPointF edge_2(e->scenePos().x(), start_point_.y());
selected_points_.push_back(edge_2);
drawQtPolygon(true);
if(!img_with_polygons_.empty())
setNewPolygonEdges();
selected_points_.clear();
}
}